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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0687683638cf12f0bdf4b28cd8dab7d4a13aec0b70882c93695836a37eaf59e' 
  AND token = 'LLdqo5R6Vm11h9PazMjpYZx2mjH9tUs0Do6FR17HOxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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