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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ec2d578ce74fd6c3c5ffa6252605896f536695cc3f580fc52770e4d3a089de' 
  AND token = 'tGXdN3ZYZRpJ/C0S4h6givmG/LzYrnlE2i0QuydNwyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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