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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99533e26f92f6736b51aef4211e87f0afb6d9fa3e839300a75244e8162db66da' 
  AND token = '3QDDmABMBC3VbX2JpdkbDqUFnzAWCEN7SkVR/pl+Sok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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