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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3e6d3091fd0c0ae103ec44e7a52b887cd3f7117650fa9e93d73977bc168e74' 
  AND token = '9i3MzmS9H+xhRlfA8L32qlpBp56CZz3EpyMwOkE+t0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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