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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917dfad74ed5cea53864e43137f9cb1e4a6b1082bedfd4e0fee1caa25f77699f' 
  AND token = 'cq31qUhNcRfVQEMsyEeyA8SgFD0WC3VngltVWl2XjfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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