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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac55273cd6b6573c3c1758a6e51e47fedc27f260d7c9739b9774279ff5d76ee' 
  AND token = '7UCorW4h4PF5CALJnBduWLh3DB3eKlR+hYhZw1OYTxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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