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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8d43318e6c72232d98d7be6569fe5a08635894cfd23d229d1e9ce6929e5535' 
  AND token = 'uH7l1pe0ka10j/idDbtbvZhS/THuS5VK7ei0DzxknH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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