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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9cbe0d6539a58780778d0bad6b0fc0da61d87c38d92f0b35838ec8a9fb9ca0' 
  AND token = 'n6d/tR/oQy4Xz6WucYwoNnjV807QIxvKCvK2hyHCuHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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