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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa336f69dea461942a9bc86f64f68d33c7cc4ff81be9529ebc48fbac30053c2' 
  AND token = 'ipUP/pZNR45Efdji8gv3YCroBoYxtn1A0RRcHe29Tws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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