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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b98c8619196d6b7206720917cc83f31929cd35ba4604f761928c10aac86260' 
  AND token = '9T4s6I5gxg/jxMZYGX+o2wrE8dQclMil/42kOxWwnmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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