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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290b5c89d3d83b6d7312afb436b569c0ac82b42aac770c8a65a2680356eb8590' 
  AND token = 'X6tZP01bDTP2OwiLQh/u/T7GBJwloEg3s5XZHcEHqfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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