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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41783b67163e6aecbd84f754d484c14059d1a9fdb830d220aa961e5688a43b2' 
  AND token = 'oh5GycG6ZHhMtailDhO2h9+6MqHxRmcosmBYz9GlWhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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