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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57a622325c01f73aaf524579f391089d59dc8075fae776f802b6ec70ea22395' 
  AND token = '4krup5qFDt3Tqlhj0kA79XN/AENLNn2L1ZLICAOKr/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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