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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f038bcef5f4c039a5c55a3f1e4dbd692513c7f20b1ef6377cd5667c19aefd7' 
  AND token = 'V49Q3tT+0LcRYA4S2ngHIYhKjHPxrCNm7uTPwF9f1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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