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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b834fea519634888d60341f985a43955251c0df3d49e0917a383525fb64f1f50' 
  AND token = 'cAl1oCWxRWSIAXmJMdSLqnY9aU2fMP6xTipJd1TnTFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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