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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb162350d5826b004d3f00961ef5b4a3deade02a6e84364faabc05f36af92394' 
  AND token = 'e5WcGZckp/a+ZRp4ZiHF56ts/n2MYhZhLepDBMJbxYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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