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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9d60ee2693fd8bd231cca65ef1f3d8b3ec1c3277ca93dd2cdb8ecd9d212f4a' 
  AND token = '4am0vQO1IU3uEZXRtkJi38IXqYZx8x4/Iw00OmabI3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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