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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b5b1e2958010ebc6169380f35ca716a3fa10124096cdceef14ad802a9eaace' 
  AND token = 'EZZfbQr/19UiPtaIO9O2nmrjr9878yoDfzA/nhh43WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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