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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70bc3b7de49c76c871e59af9ee9e8cd818720e2771764e99599a4ee0f0b5ef8' 
  AND token = 'l59P7Lth4HQpe97s05WMKyWIQQN44dyoYFT31+gzeKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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