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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73d7a8d5d692966c61bcd2aaa5f5dd7a66156460bda782bf90f0a0660f71204' 
  AND token = 'J+f+p39yTfrxBp8B1mNnRvvzco7PhT4T86zQqacZvgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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