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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc1b8d746bb3550cf12652beb20530583ef03f109d29c2d20282f8c2ccd375d' 
  AND token = 'IVOmjClkCDRxnSWf5cGWnOgDEMjvLfX4CBGLVD5Lwng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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