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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843bc0cd60323048eb92759a18f0d9570b1ef057067c39c866dcef0df8731a9f' 
  AND token = '8BihIeos2UHwRNlqxEIDeh05d2C1b1aSK1ESNiGo5bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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