SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5bad6927376294adfffdd33a809d25a79f82cf109c952a97193b08d6f4e6c3' 
  AND token = 'exG+4Ty4BwaJs3sYbUkVrLX36qDvqxPCRNKvFO2R9vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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