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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a9f48d37949024fe3c09a3e687aad8bd52d837f203c1e3fafcfa85061a5a6c' 
  AND token = '0CVfCPfdBTx05c6QskyMw+Y8+So+hSTHfacZODkEWgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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