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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cff38ab8505219e50a3887b9d13dfafea59e10e8e8da8d8938367a463f621b3' 
  AND token = 'pAngNHuD1sjIt58ykX92mjzZiu+UrRKS6HTGGTjniQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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