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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879927144b6eaf09c9fdbd8601e4c1c8b9abd1970ece5a3c1181945f94b043c3' 
  AND token = 'D1QtAF9l//AvOJYX/w9bxx4+YGkC/twvRbh6h5B79SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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