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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82f26860f60479db0534851fcab71b7080c9bd623d9b1c4d32c6ef85a7de19b' 
  AND token = 'L1a4v5HIKuFe4WuoPCOoUnV1onocE2ujzLU/ZKNr87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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