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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dff4d8fc07665696189e178e336c8c5669c89cc1046025eca52c234ab43cab' 
  AND token = 'XbeV3vxlJUJj5ojxw/E8/E/dbocYk4uXkYIayKkW8a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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