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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deae3c52f34c5340df197df2cbaa9a4c7d54b9b9057c3680b12df534c7dc1817' 
  AND token = 'dbjki+7mQ8Ag2n45n530OKAyNC/3RJrPOqpS3P08puo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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