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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77862b3a255682dba6146344f5b51dc787fe42cc83faa4ca1a3e83dad16e830' 
  AND token = 'po813iFSDto0vwJdezrpLeN15MI+NkUq0QssNGUHL4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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