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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb59544bef5b80c0477988dbdb190b27cf6299a3111b6fd46b5eaa65c4bfd4d' 
  AND token = '6GqvJskWzllLhztRLvP6c45gU5gARrAl3j37LwmU5w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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