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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34e59e8d485ee4d1a39fb053ab882d3ee3b1acf4c40844253826ae4482f0af8' 
  AND token = 'Cy0PoYhSwEv71n+8UcJ6qv8QilV6xWquLhsMQLkYy4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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