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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659ea7e569e392fcab9bf12904208a57c9fbe858f7fd93cba71df71fb3ea7f56' 
  AND token = '4sc8V3ioVaOk2bkEUo/VinaCQq2BID/Vh8dQxyW4VNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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