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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c228d85788349f3226d5dcbf3b15b72c80d7082ec0f2f71ccd5f3a4dfd09b9' 
  AND token = 'qTbmjfNnTsqRIObYndLVZW6a82Rs59YIZP6aqpl7RI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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