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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a41f47ba04c13e602efa15cca53156e63e2e9f7cb6f9b8809dfdb3bbcd9628' 
  AND token = 'UyCLseyOIw2FYRoHwg5AuNbGXp6JEb7Q64f1/50Z87M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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