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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798461e5591e739892a8054a1828029aec1aef22ed7169da3bfadf29ee709f43' 
  AND token = 'Ux9O+Of4dUsA+S1ofRH4eyh9PdHggF+U833Tz128LJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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