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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8692d9b162be2b2276ccc04c78b994c40caaa9b868c610f7c2ff4919a42ffc5c' 
  AND token = 'lne57lXegvlsfFIi9NrKbwDX6JAK+woq1+LmkP+0VGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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