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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2459d7ec363496157fa850224a359fc27a726cfa3a6e39eec5cf49fc84ddf1' 
  AND token = 'uUP80gF0mMyKkwlWRu1ldzKZ1AduJ90UDJlpetNM1+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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