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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9429ec0f16dbd9704edb7194216ea3a9a51e1c1e7105708b6f025005f04b38f4' 
  AND token = '7yra3zo2p+TdZ+Awe9WXg0L/ue9GgKDm/geE6HyFBvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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