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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3c3e0b16243f853dcb7391ac3f8a3f2a55e789d6e296f360e08dd8f826baa6' 
  AND token = '5QHD88FfVYGAliFJm0Ejz9Db0wUBDuWmBUVvyHGZo8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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