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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e7373bd7f0c7bb231c84c9944da36a8d317bd36801759393af0dc45ba8090e' 
  AND token = 'bbyAMZKrlyKsHtCX6srYz6rSTs5IsignK8n2kfYdpuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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