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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401dc39f981d82af4e1ab2643e4c11e7e9cc750b9e4efa18e502ad2fdb37f52c' 
  AND token = '2FlG3q8LBFSmeJyam7exD2w1azHQtWUH/wt6QXygLk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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