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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cb84a00d2eefc80e5579545e361a868c84d84d3949573936ef1f9f9a573208' 
  AND token = 'lj2a9dMyLAGeny9S5Qmi9Zdhfl11v8HquVkN5U7QfWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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