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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe17efe0f80b3d2d9507f4520a562bdc12b8d563b0a9ff8df68fb24f1408f24' 
  AND token = '9mwmRgt+oxAzkbt7BYsJ1NkGCimj+8U0gcIdjsiFu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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