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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c0aadbdc64645dcd7504b41c5f62571bc5126ebbf62d39e503339cc12ff3fd' 
  AND token = 't8snnHgT4atDgnaokj/L2vcSL/4bw3f2gcHiWp2ZNSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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