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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9451a7a64ff23a476b2d1dfd8c6965aa76e5dda88cfbae671cd95b1904de506' 
  AND token = '0uilQBwgJdd2plZSHT+W8qe9mZd/wbUGKpBydtwgcmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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