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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8623626042469b62eb2bd30fd57456da14b591033bbc01573c4bc38f80d19da6' 
  AND token = 'MlU+6li2JhCXuL4II43QrA8tdLInVuuX8TNYaVhLHUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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