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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6134e37a5b6249d5373d2402c7731af94599bf44f9adca1c7154c2fb38c152af' 
  AND token = 'dCvkMikGJrZHYwGryHhPP79/1Yds0LmFeWF0zFbAPCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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