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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd146c2565646ddee678846cd16985fd6786acbd001d67651d104d61ed7075c' 
  AND token = 'cRQ82bw6zhxx7o2x1H0cF/cMbHSTlscmtaoJuaaLTos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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