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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00d427a9deef331d151dfb11875af901e4fcb96abb4a1f8422cdf7b1b89798c' 
  AND token = 'cf4CCy6B6d+Qt4QQOjEoNbf2Icu1qTY1CY/vYSjg5HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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