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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6116f72bf8ea2317620ed0cbeb2f6277556b243af46b66dea9a7850d218763fa' 
  AND token = 'CHgMs3nlKqq8EVlLTSPec9x6j+iS3p8XPX4yDkkNHrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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