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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83be342319e649a33c1783c03789032983e2ff5fed8cb59d6c0d8a596943a9a6' 
  AND token = 'kuw3DiWpDmpI9U9SAmpclSfB7BQZGP7uyk75zHFGXRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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