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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd984aed0cb3177e2de855e4344206913bf1990ebc5c982c672726e88f7e1eb68' 
  AND token = '0aX173PX6b2k/a8CZudLCQT5qPboOhcJK/QU75AINrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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