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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fed8cb27830e391fbd830f1255cf9cef38a3cfbdc89817f94544a4c70f4ad15' 
  AND token = 'QGypaHFnZxOfy7CyZgs1Fu7L4VasIpPLfAEi/tlgoGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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