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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e6d35a559f1129f1a70c2dbaeb87dab58a515364372e7082e289d34f4f3eee' 
  AND token = '808n7vbPYfw15wFXH8doavRKVXYYPcQLKmkIFrlXVPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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