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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9455a46bdcc83ec89e1e7941fd1d858067caea8d91a739bb41c6548e426160a4' 
  AND token = 'up2hrU3T2ogmXoAUZoneSj0w7MeDADSZH/z4aNXy0vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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