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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dae18807738345d3c14465f33bdbe90f2fa4f6c609bbed3856b8183035d29a4' 
  AND token = 'AbJeJXYPocrC/eh5SbmUrB74Zhr9EIAK0xG05C195bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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