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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1c2ee3a0d7ac9c015a3e5ea423c0c92566874a45e8f2d5e4f9b35282c8520f' 
  AND token = 'SpEw8lUokfoNTDBmSQdQ8sNFL08hFJpcBeJb8MekKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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