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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937b6c1cb409318f49cb0d5567dcb1cd4e648217bcb21b665d1bd51263702e9f' 
  AND token = '0byHihyfsXH8m/zer2Tgr2pp1UCzNXRgwsz0mBC7FmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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