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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11ee68d7ee00895e49d374ca300ffa2d358d90a40043e57afec914362ba09c9' 
  AND token = '0NQKJVG/r/ZiO9Hse9O7lAc7lcyJjQlbLruHySiBXi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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