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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf6b7d24fa58f2d1fbb7401e10f037951e82357e7269c19c3986f79e64c257d' 
  AND token = 'c8pxyHLsNyrRZJj2NSpp7W+K7w5aNCJpP6S/rq/Z11w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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