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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc82765de2e49336c74d4fcff473a7c94adfb6f8d52fe5c655589b337d9c38f0' 
  AND token = 'fzezmpXOo9h0gmBhfqp3J1UxEs17txspqZ7Ii2iPQQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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