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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283bec59a607633782d9db256367fcf65d349c2afd4f49b75f61dace15f71305' 
  AND token = '8pdSWe+rsXx4gHrruwiStNdLlkvE9AtGxn5XiSjrd3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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