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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb7e7f3048c6f5a9792ab4d5068ba4668558d8ecd8cf011e87a816ea0b24a37' 
  AND token = 'kKrNE+0RGops9EcMWXpHu6kwOX0g/H1ddCqYcXq5dPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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