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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e92b62f9db8ea8bab227233d9399bae83cc9cc03e7e13b3b6a8c6122358cc2' 
  AND token = '3kCJsKdH2swaSE9wy51DF9o8Sz3Ld+fzNz0L7YrHmF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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