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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a81b53e3989009a318add1cb45eb8887bb1da6a245c332d64a3c0b673286da' 
  AND token = 'JBUUnS2KIaWlJt0qd6DZv5R1Z10tSR5R/lH/I8NKpkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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