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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394885744b68ccf660df0125dfdf0085a410a30fc36e846bcbfd1b73bcf76f85' 
  AND token = 'sxiOi+yUVOKvYpMs8mflJCvI+WOAl3HvJVsXe6bzz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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