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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3cf3e6f82439b78e0804a6ee61d71cbabe367cc9f0fa38f69d22be52d60a09' 
  AND token = '2Sgz4/q+99unzS/EthItWVTyuizYTnBwcBOa2cOKiiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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