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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c98e46b20016c626ba3d0cd2fdcd1d6a2815a2a6d687cc9a2c61095ef0c668' 
  AND token = '7tKqFf3SpV2fcgoe34OwuSLhpamJGiYCOOxWwAnSZiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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