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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23acf2060fb80608662508331d6a7b33392f56aa32817a8045db4993f137e557' 
  AND token = 'bbsBT3/QrwccpIII3bnPLhbHUo2yrdVl4ZpjIYcmht8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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