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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fff892c53f9fae7633fde29e08de577ae8c4f6295e15720ab7122bbe4881aef' 
  AND token = 'iUDmZGsV5PY4qqsu2XLdFzb5khdCbyXYw5UGiVhmWL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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