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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f736d5eac861d5978506c1a99af00f72179428f7a3fef33174c20aba5d4f057' 
  AND token = 'd30D98dcZE8n/r2vu+GKx3T/6ZGzxpax7e0NUgzA4dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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