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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0f95cb382d78680889d1465baca7861a90faa14374d9ea91bafc32d95a7846' 
  AND token = 'qsZ9TUA7y0udY9kOhgmEsaJ2PLeCuix8PVW3nO9Uq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}