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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c1854522535a42182a7d964b8029c1ff34acd4e1dbab57ad67c24c665120f4' 
  AND token = '2S/UhmB0eI7eVkLtQtK9AEtkUojEC62JoczJYhKc5S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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