SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67809c50518adb536afe78e45929fc3ab67c97b405f3e77036b710838e7f8ec5' 
  AND token = 'YBzkFjHlcjMYl40whULBZ7egAORX/Ai5tYm4qkOWAvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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