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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719ebe72553fde6f3be8866a3c3f967e5842b082620b55a4de17c9a7cc334a1b' 
  AND token = 'sgJl9kNIIBRFgvRIO7QgLyNYqMv8nsDJJcQxJiH0TK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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