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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aace792e525fc6183884383c981cb7f0a4fe96553c9a79d073cf15843b8ede' 
  AND token = 'Q+2VX35ysq6nE3WECKtW5BTApajd8xzo8t2jXzepDjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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