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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f730d9791040447c981b7e26f7840ab2f457a507f7bd23e21a5bd2b77855800' 
  AND token = '2SB76wf9xVmgPYMLSOLrwdK8Co6Kqy7bq35nieyOrpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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