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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f56a66419e79e8425a4ee10b0ded7e907494398c59932aa722c198b00d155d0' 
  AND token = 'WuvNfDLjDiIEabcg1MJv0CnP0dqjcUvq4Hr11dFUR5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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