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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fecf5d0407d8c21fc7819d9cafbb1cd9459decccbdc82434cf4d64a3854faef' 
  AND token = '1DEAIWN5XQFDBVJRCcqfrP/1DH25xFPL35V+pprgcbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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