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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933c3db22a7dc0d650e7e566d610655641ca8b95d4d0f9ba717f03ae09a8847a' 
  AND token = 'MhvzWOz9GSCUE84ygbWkO/HiTMAmj9/H/l7Sc3l0vC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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