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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32d7829e2f133271295a3cff08d44a2e78a9c151f572575c1699207d7d52439' 
  AND token = 'tKejIXKKn+gCBF75ZfTgZcnmsLkhgvdz3Ae2jDmS80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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