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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9900dcede2c7472f7c10a545c503249d90f7e3b6ecfa64944d13a4b8c39dbffd' 
  AND token = 'Jb7EmRKIueiojWYZKIvu9J0F2Zdeg29qZOQ6RUA44eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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