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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11448cc5e5408f78c64b55fbe35b4f2f9cfd7f576129ed2f3cdaba32666df8e6' 
  AND token = '9uhr4vTyl/QLa+a4FfpQCfSaQXaeBie+K0DO/XgT8LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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